AI · alternatives · 2026
24 alternatives to Altworld.io
The AI life sim where the world actually remembers
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
- 1
Hi HN community! We want to share AI-town, a deployable starter kit for building and customizing your own version of AI simulation - a virtual town where AI characters live, chat and socialize. Inspired by great work from the Stanford Generative Agent paper (https://arxiv.org/abs/2304.03442). A few features: - Includes a convex.dev backed server-side game engine that handles global state - Multiplayer ready. Deployment ready - 100% Typescript - Easily customizable. You can fork it, change character memories, add new sprites/tiles and you have a custom AI simulation…
2023 · github.com · its alternatives →
- 2
Exists▲132Generate your own 3D worlds and team-deathmatch in minutes
2025 · exists.ai · its alternatives →
- 3
Your AI Clone▲113Your clone remembers people you've never met
Feb 2026 · brussle.com · its alternatives →
- 4AA
This is a weekend project that spiraled out of control. I was originally trying to get Claude to play a ROM of the SNES SimCity. I struggled with it and that led me to Micropolis (the open-sourced SimCity engine) and was able to get it to work by bolting on an API. The weekend hack turned into a headless city simulation platform where anyone can get an API key (no signup) and have their AI agent play mayor. The simulation runs the real Micropolis engine inside Cloudflare Durable Objects, one per city. Every city is public and browsable on the site. LLMs are awful at the spatial stuff, which…
Feb 2026 · hallucinatingsplines.com · its alternatives →
- 5
LifeOS▲99Turn your AI chats/memory to intros with real humans
Apr 2026 · beta.yourpurpose.ai · its alternatives →
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Free Real-World Intelligence: Give Your AI Real-Time Access to the Physical World. Grassland lets developers give their software an API for accessing real life environments regardless of economic, geographic or political barriers.
2019 · grassland.network · its alternatives →
- 8
SIMA 2▲204Google's most capable AI agent for virtual 3D worlds
Nov 2025 · deepmind.google · its alternatives →
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A living world of AI characters. You can only watch.
18d ago · thesentient.world · its alternatives →
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Guess what artificial intelligence labeled random images
2021 · thinklikeabot.com · its alternatives →
- 14
WorldOS simulates living AI worlds: chat with characters, watch social feeds react, trade in-world stocks, browse a generated web. Create your own world from composable apps and share it on WorldOS.cc.
Jun 2026 · worldos.cc · its alternatives →
- 15
RimWorld▲72A sci-fi colony sim driven by an intelligent AI storyteller.
2015 · rimworldgame.com · its alternatives →
- 16
Dear Hacker News, I'm kindly asking for your participation in the open beta for my AI-managed mini-games website. Thank you in advance! For a limited time window, I'm setting the all-free feature flag to true. I hope you have a lot of fun exploring the AI's sense for games! Here and there, I tweaked it to help with visual consistency. I would be deeply grateful if you opted into analytics. $2,300 in API tokens... Cheers!
Jun 2026 · minigames.world · its alternatives →
- 17
AI Life▲2An AI companion that remembers you and cares when you're sad
Jun 2026 · play.google.com · its alternatives →
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Build your own fictional worlds and explore them with AI
2024 · myadventures.ai · its alternatives →
- 20
Live a whole life inside any world you can imagine.
Sep 2026 · anyworldgame.com · its alternatives →
- 21IB
You speak to the Oracle of Aion, an ancient entity with the power to affect the dungeon. If your wish is worthy, he may grant it, and the dungeon remember your wish forevermore. The changes will be visible for all players, forever. Play now in the browser! Free and no registration. Disclaimers: I singlehandedly made this game, it is in a crude state, the oracle works 50% of the time. Also, since your wishes turn into code automatically via AI, and literally anyone can wish whatever he wants, dont expect a polished experience. However, nothing like it exists and its free, enjoy the chaos!…
May 2026 · aion.quest · its alternatives →
- 22MW
We built a tool where you can simulate anyone, in 30 seconds, using all of their publicly available data, for free. Check it out
2025 · mirr.world · its alternatives →
- 23
WorldX▲1Type one sentence. Get a living AI world in 5 minutes.
May 2026 · github.com · its alternatives →
- 24
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →